免费 JPG 转 PNG 工具
在本地把 JPG 转成 PNG,适合截图、叠加素材、设计文件和源图准备。
先在本地把 JPG 生成 PNG 副本,再上传或发布。
关于这个工具:免费 JPG 转 PNG 工具
Convert JPG images to PNG locally in the browser for sharper screenshots, overlays, and design handoff. 无需上传——全部处理都在你的浏览器本地完成,兼顾隐私与速度。
常见用法
- 需要清晰 UI 截图或后续可能加透明通道时,用 PNG 更合适。
- 文件只在浏览器里通过画布重新导出。
把 JPEG 转成 PNG
JPEG 转 PNG 不会把 JPEG 已经丢掉的细节找回来——但它能阻止继续变差,并给你一个可以反复编辑、裁剪、合成而不再次降质的无损文件。
这个转换什么时候有用
- 1
当工作格式用,不要当画质提升
PNG 保住的是「从这一刻起」的数据。JPEG 压缩丢掉的部分,它补不回来。
- 2
先转再改,别改完再转
每存一次 JPEG 就重新压一遍全图。先转一次 PNG,然后在 PNG 上慢慢改。
- 3
接受文件变大
无损存储本来就更占地方。如果最终要去网页,最后再转回 WebP 或 JPEG。
JPEG 转 PNG 常见问题
- 转成 PNG 能提升画质吗?
- 不能。它能防止后续反复保存造成的继续损失,但 JPEG 已经丢掉的细节回不来。
- 为什么文件变大很多?
- PNG 无损、JPEG 有损,所以 PNG 要存多得多的数据。把它当工作文件,而不是最终交付文件。
- 转换是在本地吗?
- 是,而且完全不消耗积分:整个处理都在你的浏览器本地完成,文件不会上传。
拖入文件或点击浏览
等待文件中
先添加一个文件再开始。
原始大小
-
输出大小
-
已保存
-
仅在浏览器本地处理,不上传。
原始大小
等待文件中
输出大小
等待文件中
小提示
- 需要清晰 UI 截图或后续可能加透明通道时,用 PNG 更合适。
- 文件只在浏览器里通过画布重新导出。
相关免费工具
Free Image Converter
Convert PNG, JPG, and WebP images locally in the browser for uploads, reviews, listings, and handoff.
Free WebP Converter
Convert images to or from WebP locally in the browser for smaller web assets and compatible downloads.
Free Transparent PNG Maker
Make a selected background color transparent and export a clean transparent PNG without uploading the image.
Free Favicon Generator
Generate favicon.ico and common PNG favicon sizes locally in the browser from a logo or source image.
Related 3D guides and workspaces
- Photo to 3D ModelHow to shoot a photo that converts well, what fails, and what the GLB contains.
- 2D Image to 3D ModelPrepare illustrations, renders, and sprites, and know what the back side invents.
- 3D Pixel: Pixel-Aligned Image to 3DPixel-aligned criteria, source-image checks, and voxel/texel resolution for a GLB.
- 3D AI: AI 3D Model GenerationChoose between Pixal3D, Trellis 2, and Hunyuan Motion before spending credits.
- 3D Object CreatorWhich object classes convert well from one image, and how the presets steer the mesh.
- Image to MeshWhat the generated GLB geometry contains, and how to inspect and repair it.
- 3D Asset GeneratorThe handoff checklist for scale, textures, triangle budget, and engine import.
- 3D Printing AIGenerate a GLB from one photo, convert it to STL, and check it before slicing.
- Text to MotionDescribe an action and generate FBX motion plus motion JSON instead of a mesh.
- Image to 3D for ShopifyTurn a packshot into a GLB, inspect it, and test it on a product page.
- Image to 3D Model FreeExactly what a hosted job costs, and which browser tools need no account.
- Open Source Image to 3DWhich upstream models are public with their own licences, and what is hosted.
- AI Generated 3D ModelsWhat one image produces, and the checks to run before you use the result.
- Image to 3D Model GeneratorPixel-aligned image-to-3D with GLB preview, PBR textures, and motion output.
- AI Image Generator WorkspaceText-to-image, image-to-image, and photo editing in one hosted workbench.
- AI Video Generator WorkspaceSeedance 2.0 text-to-video, image-to-video, and reference-to-video.